﻿/*
    Parker for Kaixin001.com 

    Copyright (C) 2008, TurboZV, turbozv@gmail.com, http://www.turbozv.com/

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    *KEEP THIS HEADER INFORMATION*
*/

using System;
using Microsoft.JScript.Vsa;
using System.Text.RegularExpressions;

namespace Helper
{
    public static class ScriptHelper
    {
        // Added by jetic@sina.com 2008-9-26
        public static string GetAccCode_Re(string content)
        {
            string Pattern = "";
            string accCode = "";
            string script = "";
            string script_tmp2 = "";
            string var_values = "";

            //得到所有script段
            Pattern = @"<script.*?>(?<x>.*?)</script>";
            MatchCollection scripts = Regex.Matches(content, Pattern, RegexOptions.Singleline);

            //查找符合要求的script段
            Pattern = @"function\s*?acc";
            foreach (Match script_tmp in scripts)
            {
                if (Regex.IsMatch(script_tmp.Groups["x"].ToString(), Pattern, RegexOptions.Singleline))
                {
                    script = script_tmp.Groups["x"].ToString();
                }
            }

            if (script.Length == 0)
            {
                TraceLog.PrintLn("Not find acc()\n");
                return script;
            }

            //区分函数体内的和函数体外的声明
            //移除所有函数体
            script_tmp2 = script;
            Pattern = @"function.*?[^{]*?{[^{}]*(((?'Open'{)[^{}]*)+((?'-Open'})[^{}]*)+)*(?(Open)(?!))}";
            script_tmp2 = Regex.Replace(script, Pattern, "", RegexOptions.Singleline);
            //TraceLog.Print("script_tmp2=>{0}\n", script_tmp2);

            //记录所有全局的声明
            Pattern = @"var.*?=.*?"".*?"".*?;";
            foreach (Match var_value in Regex.Matches(script_tmp2, Pattern, RegexOptions.Multiline))
            {
                var_values = var_values + var_value.ToString();
            }

            //记录acc()
            Pattern = @"function\s*?acc[^{]*?{[^{}]*(((?'Open'{)[^{}]*)+((?'-Open'})[^{}]*)+)*(?(Open)(?!))}";
            Match acc_f = Regex.Match(script, Pattern, RegexOptions.Singleline);

            //全局声明在前,acc()在后
            script = var_values + acc_f.ToString();
            //TraceLog.Print("script=>{0}\n", script);

            accCode = ScriptHelper.runJs(script + "acc();"); //动态得到acc结果

            return accCode;
        }

        public static string runJs(string scriptText)
        {
            VsaEngine ve = VsaEngine.CreateEngine();
            return Microsoft.JScript.Eval.JScriptEvaluate(scriptText, ve).ToString();
        }
    }
}
